Fluid-controlling mechanism



J. P. FISHER FLUID CONTROLLING MECHANISM March 15, 1927a 2 Sheets-Sheet1 V I I o 7 March 15, 927 J P. FISHER FLUID CONTROLLING MECHANISM 2Sheets-Sheet 2 Filed Nov. 15, 1920 Patented Mar, 15, 1927.

UNITED/STATES,

JAMES POWELL nrsnnn, or BARTLESVILLE, OKLAHOMA, ASSIGNOR, BY MESNE AS-SIGNMENTS, 'ro nonnn'rvnnsnnncn COMPANY, on NEW roux, N. Y.,-A conrona-TION OE DELAWARE.

FLUID-CONTROLLING ECHAN SM. a

Application filed November This invention relates to fluid controllingmechanism and more particularly to mechanism adapted for use in a gasdistributing system to limit the quantity of gas which may flow throughthe individual service lines and to regulate the pressure of the veither'through accident'to a service line or because of abnormal demandon the part of theconsumer, gas might be taken from the supply mainsalong the line in quantities many times greater than the normal demandon the line. Manifestly, such an ex cessive demand might occursimultaneously on a number of service lines. Under such conditions, inorder, so far as possible, to

sumers at all times, it has been necessary to maintain relatively highpressures in the supply mains, entailing greater leakage and loss of gasthan Would occurat lower pressures. Moreover, damage and annoyance haveoften been caused to consumers, more especially to. those who derivetheir supply of gas from portions of the mains relatively remote fromthe source of supply to ,the

mains. through inability to obtain a normal supply of gas by reason ofexcessive demands on the part of other consumers.

Gas distributing systems are commonly divided into districts, eachhaving a. regulator for determiningthe pressure at which gas is suppliedto the, district mains. The ,district mains are preferably large enoughso that an adequate supply of gas may be delivered to each consumer withrelatively low 7 pressure in themains. When, however, the Z'I districtmalns are small in proportlon tothe demand on them, it is necessarytomaintain the gas at the district regulator under high pressure withlarge difl'erential at times of I I- extreme use ofgas betweenthe'pressure or the gas at' the regulator and that onsfer 'ce insure anadequate supply of gas to all con 15, 1920. Serial no. 424,144.

lines remote from the regulator.. In such cases, the pressures of thegas in portions of the district mains is too great to permit it to besatisfactorily burned for most poses" including household use.. 5 It isan object of the invention to provide mechanism which will limit thedemand on the service lines of a gas distributing 'sy's-Q tem, and whichwillre late the pressure},

of the gas in the service l nes'to'the end that,

each consumer served by thesystem may be] assured at all times of anormal supply of. gas at a pressure-best suited to his requirements. f

With the above'mentioned object in view, an important feature of theinvention comprises-a housing constructed to allow fluid such, forexample, as natural: or artificial gas, to pass through it andcontaining means -r controlled by the fluid for limiting the rate 170 offlow of fluid through the housing and regulating thepres'sure at whifihthe fluid is{ delivered from the housing,

v In accordance with a further feature the invention, means 18 providedfor causing 7 a drop in pressure of fluid alas it passes through ahousing or other fluid conductor, together with means for utilizing thepressure differential on opposite sides of the'firstmentioned means tocontrolthe rate of flow: 1

of fluid through the conductor and means for regulating the pressure atwhich the fluid issues from the conductor. In the illustratedconstruction, .the flow -of the fluid is-"controlled. by a valve, andmechanism is provided for operating the valve =both in accordance withthe pressure difi'erential of the' fluid at certain points in the.conductor, and in.aceordance with the pressure of the fluid on thedeliveryside of the conductor. I r l Another feature of the inventionpertains to the rovision in a fluid conductor of a valve or controllingthe flow of fluid through the conductor and a lpair of diaphraginsoperable to control e valve se lectively and independently in accordancewith varying conditions of flowof fluid "through the conductor. Assho'wn,the diaphragms are joined the valve by lost mopur-- i' the otherdiaphragm.

A still further feature of the invention'resides in a fiuid conducting'housing contain- 'ing a T controlling valve, adiaphragm to which thevalve is operatively connected, and

an orifice disk for inducing drop in pressure of fluid passing throughthe housing, the housing being constructed to cause pressuredirectionlof the arrows;

trolling device embodying the preferred form or the invehtionf I of ig.'1,

of the arrows;'

the diaphragm chamber difi'erential' on opposite sides of the disk totransmitted to opposite sides of the diaphragm so that the valve is madeto control the How of fluid through the device in accordance. with thepressure difierential' produced by the orifice disk. 7

Other objects and features of the invention will appear as thedescription proceeds and will be pointed out in the In the drawings,

appended claims;

Fig. 1 is a View lnplan of: a fluid con- Fig. 2j, is'a view in elevationon line 2-2 looking in the direction of the arrows;v 11;.

Fig. 313a view in elevation of the device takenonthe line 3-3 of Fig.2,looking in the-direction of. the arrows;

Fig. 4 is a view in elevation'of the double poppet valve;

1g. 5 is a sectional plan of the valve on line 5--5 of Fig. 4, lookingin the direction Fig. 6 is a sectional plan of the-valve on: line 6-6'otFig. 4, looking in the direction of the arrows Fig. 7 is a top plan viewof the valve cage'; Fig. 8 is; a view in elevation of the valve cage online 8-8 of Fig. 7 looking in the Fig; 9 is a section through the valvecage on line 9+9 of Fig. 8-, looking in the direction of the arrows; and

Fig. 10 is a view in. sectional elevation of the fluid controllingdevice in a form in whichit may be employed to control the rate of flow:of gas without pressure regula-- tion. Q f i The illustrated devicecomprisesia housing 2 constructed to serve as a conductor for gas orother fluid and provided with inlet and outlet openings 4 and 6respectively. As shown, the frame structure of the housing 2 is shapedinwardly ofthe inleti opeiiiiig 4, to forman inlet chamberScoinmnnica'ting with achannel '10. --'lhe channel-1O isseparated byanupper wall 12 from the lowers; portion of a diaphragm chamber 14 and bya lower .wall 16 from passages 18 and 20 (Figs. 1 and 3) extendingdownwardly from v 14 and meeting be low the wall 16. ,1

The walls 12 and 16 are provided with openings in which is seated avalvejcage 22 (Figs. 8 and 9) comprising upper and lower rings 24 and 26respectively joined integrally by bars 28 spaced apart to affordpassages 30 between them. The passages 30 allow gas to flow from thechannel 10 to the interiorofthe valve cage, and ports 32 and 34locatedpentrally of the rings 24 and'26 respectively permit it to passupwardly and 14 both directly and through the passages" 18 and 20.Preferably, and inthe illustrated downwardly from the valve cage, thusestabconstruction, the upper ring 24 of the valve I cage 22' is providedat its top with anoutwardly projecting flange or rim 36 constructedtofit into a circular channel'38 on" the'upper side of the wall 12 and isformed below the flange 36 with external screw threads adapted formeshing engagement to match a correspondingly sha ed groove in the wall16. This constructionhfenables the valve cage to be firmly secured inplace in the housing 2 but renders-it capable of sired." In order tofacilitatesthe removal 1 of the valve cage from the housing, the upperring 24 may be formed with inwardly extending cars 42 provided withsockets 44 adapted'to receive appropriatelyshaped ele ments on a spannerwrench or the like.

. The housing '2 is formed to provide; an outlet conduit comprisingachamber 46 communicating with the outlet opening 6 and demarcatedfromthechannel' 10 and passages 18 and 20 by a wall 48 and from thediaphragm chamber 14 by a .wall'50. An

opening52 in the wall 50 allows gas to pass.- from the diaphragm chamberto the outlet ch'amber4'6. From the'foregoing, it will be understoodthat the course followed by gas llU or downwardly through theport'34 andupwardly through the passages'l8iand 20 to the diaphragm chamber; andthen through the opening 52 in the wall 50to the outlet chamber 46 andoulct opening 6.

As hereinbefore indicated, means is provided both for limitingthe rateof flow of fluid through the housing 2 and regulat-' ing the pressure atwhich fluid is delivered trom the housing. Preferably, and as shown,

res

suchmeans includes a balanced poppet yalve 54 (Fig. 4) comprising asleeved ,portion 56 pinned to a stem 58 and formed with horizontallydisposed circular flanges 60 and 62 operable upon upward movement of wevalve 54 to close theports 32 and 34 respectively. Thecontacting'surfaces of the rings 24 and 26 andthe flanges 60 and 62 ofthe valve 54 are bevelled to insure smooth action of the valve.Vertically disposed Wings 64 projecting outwardly from the. sleevedportion 56 of the valve intermediate between the flanges 60 and 62 andabove the flange 60 guide the valve in its up and down movements andtend to efi'ect uniform flow of gas throughoutthe area of the ports 32and 34. The housing 2 is preferably provided below the valve 54 with ascrew plug 65 allowing access to be had to the valve.

In order to cause the valve 54- to control the rate of flow of gasthrough the housing 2, utilization is made of the principle governingthe flow of fluids whereby if flow is restricted at a point in a fluidconductor, the withdrawalpf fluid from one side of the point ofrestriction will cause thejpressure of the fluid on that side to becomeless than the pressure on the op osite side of the l point ofrestriction.

'-flow of fluid is thus restricted," the more oreover, when the rapidlyit is withdrawn from the conductor, the greater is the pressuredifferential on opposite sides of the point of restriction.

' In the illustrated construction, the means for applying the enunciatedprinciple ineludes a .disc 66 inserted in the opening 52 of the wall andbeing formed in turn v with an orifice 68 of relatively small size so asto allow only a restricted flow of gas from the lower portion of thediaphragm chamber 14 to the outlet chamber 46, and

' thereby cause a drop in pressure in the outlet chamber 46 as gas iswithdrawn from I the housing through the Ou l Opening A diaphragm 70,clamped, preferably. be-

tweenthe'upper portion of the housing 2 and a ring 72, also constitutingpart of the I housing, is subjected on its under side to the pressure ofthe gas on the supply side of the orifice disc 66, and a conduit 74leading from: the. outlet chamber 46 communicates iwith' the interior ofthe ring 72 above the diaphragm 70 so as to transmit thepressureofythegas in the outlet chamber 46 to the upper side of the diaphragm.The floor of the outlet chamber 46 is formed with an opening I normallyclosed. by a plug 75.

portion of the diaphragm is a smaller plate 78. An eye 80 is setcentrally in the diaphragm and plates 76 and 78 and is flaredoutwardlyat its ends to secure said parts 'together.- The valve stem 58 extendsupwardly from the valve 54 and passes loose- 1;; through the eye 80,being provided above the eye with an enlarged portion 82 of largerdiameter than the opening in the eye f The weight of the plates 76 and78, valve 54,-and valve stem 58maintains the diaphragm 70 normallydepressed. thus allowing the valve 54 to occupy its fully openedposition. When, however, the fluid pressure on'the under side of thediaphragm is sufficiently in excess of that on the upper side of the-diaphragm to counterbalance the weight of the plates 7.6-and 78,- valve54, and valve stem 58, the valve tends 't'oaclose.

Passage, of gas through the orifice 68 of I .the diaphragm. In order toprevent the correct action of the valve from being interfered with inthis manner, the plate 76 is extended outwardly beyond the verticalplane of the orifice 68, thus reinforcing the diaphragm above theorifice. a

To the end that the valve, 54 may be operatedalso to control thepressure at which gas s delivered from the housing 2, a second diaphragm84 is provided in t e housing above the diaphragm 70. As s own, theperiphery of the diaphragm 84 overrides 86 attachedto the ring 72 byscrews or the like 88. A pendant plate 90 and superimposed plates 92load the diaphragm 84. The

valve stem 58 is provided, at its top with .a head 94 adapted tobereceived in a cavity or chamber 95 in the plate 90 of greater the ring72 and is clamped thereto by a'ring i a cross-sectional dimensions thanthe head.

The plate 90 is, formed with a portion under- 1 lying the head 94 andprovided with an opening ofgreater'diameter than the enlarged portion 82of the valve stem. 58 to allow the valve stem to. be raisedindependently of the plate 90'or diaphragm 84. With this construction,however, when the diaphragm 84 is raised, the valve 54 will also beraised. A plug 96 closes the chamber 95 to prevent the passage of gasabout the valve stem 58 to the space .above the (liaphragm 84 andco-operates with screws 97 in attaching together the plates 90 and 92and the diaphragm 84. The top of the housing is preferably provided witha cap 98 having openings 99 permitting the upper side of the diaphragm84 to-be subjected to atmospheric pressure. In the illustratedconstruction, the ring 86 is formed with two a substantially semicircular grooves in which the heads of the screws 88 are received, andwhich areseparated by raised portions 100, to which the cap 98 issecured by screws 101.'

some difiiculty was experienced in the commerc al d v l pme t of theillustrated. j

device by reason of chattering of its movable parts under certainconditions of flow of gas through the device. To the end that thisobjectionable "feature which sometimes attended the operation of thedevice may be eliminated, the ring 72 is provided -'-with a baflie plate102 interposed. between the diaphragms 70 and 84 and serving to defineseparate chambers for the diaphragms. .The baflie plate 102 is formedcentrally with an opening 104 in which the enlarged portion 82 of thevalve stem 58 ,is loosely received. The opening 104 further acts totransmit the pressure of the gas above the diaphragm 70 to the underside of the diaphragm 84c. Pref-, erably, and as shown, lugs 106- arecast integrally on the upper side of the bafiie plate 102 so as topreclude the weight 90 from moving laterally to anextent sufficient tocause-injury to the valve stem 58.

lhe manner of operation of the illustrated device is as follows:

' Assuming that the device is installed in a pipe line of a gasdistributing system but that there is no flow of gas through it, the

pressure of the gas in the outlet chamber 46 and on the upper side ofthe diaphragm 70 I equals-the pressure on the under side ofthediaphragm. Consequently, the diaphragm will be fully depressed and, ifthe diaphragm 84 is also depressed, the valve 54 will occupy its fullyopened position. The gas contained in the space defined by thediaphragmslo and 84 and ring 7 2, of course, exerts pressure on theunder side of the diaphragm 84, as ell as on the diaphra m 70.The-maximum allowed pressure of t e gas in the outlet chamber 46 isdetermined by the weight of the plates 90and 92, valve 5% and valve stem58, it being apparent that fwhen the pressure of 'gasin the outlet cham-J ber 46 is sufiiciently above atmospheric to counterbalance the weightof the above mentioned parts, the valve 54: will tend to close. Thetendency of the valve 54 to close under the conditions specified existswhether gas is or is not flowing through the device. I If -a relativelysmall amount of gas is withdrawn from the outlet chamber 4:6, forexample, by reason of the lighting'of a fevv burnersin a housepipingcontrolled by the device, the pressure in the outlet chamber 46will be slightly decreased as compared I with that in the lower portionof the diaphragm chamber 14, thus inducing a slight flow of gas-throughthe device. The'pressure differential in the chamber 46 and the I lowerportion of the diaphragm chamber l l is trausmittedto opposite sides ofthe diaphragm 70. The maximum differential across the diaphragm 70 and,consequently,

the maximum rate of flow of gas through the housing 2 is determined bythe weight of the plates 76 and 78, valve 54: and valve stem 58. and thesize of the orifice 68. So

aeeaeer long as" the flowof gas through the housing 2 is below themaximum rate, the diaphragm YO-will not operate to close the valve 5%,which, under such conditions of flow of gas is under the control of thediaphragm 84;. Inasmuch as the stem 58 of the valve 54;

passes loosely through the eye 80 vof the dia phragm 70, the valve maybe operated by the diaphragm 84 independently of the ,dia-

phragm 70.

If the consumption or gas from the piping controlled by the device isincreased, for

example, by the ignition of'burners or stoves, the maximum difierentialfmay be set up across the diaphragm 70, thus marking the maximum rate offlow of gas through the device. The rapid withdrawal of gas tromtheoutlet chamber 46 incidental: to the establishment of the'maximum rateor" flow of gas through the devicecauses the pressure in the outletchamber 4:6 and, consequently,

on the upper and lower sides of the-==dia phragmsYO and fitrespectivelyto be rela-.

tively small. As a result, the diaphragm ea will occupy its lowermostposition under the action of the weight of the parts associated with it.The diaphra 8d operates at all times to prevent the pressure of the gasin the outlet chamber 46 from exceeding a predetermined maximum andfurther tends, so

longas the pressure on the inlet side of the device exceeds the maximumdelivery pressure and the rate of flow of gas is below the predeterminedmaximum, to maintain the pressure in the outlet chamber 46 at themaximum prescribed pressure, inasmuch as the diaphragm 84: will bedepressed in the eventvthat the pressure of the gas in the outletchamber 46 falls below the prescribed maximum, thus opening the valve 5%more widely and enabling a larger flow of gas through the device.

4 From the foregoing, it will be understood that when the flow of gasthrough the device tends to exceed themaximum rate determined by theweight of the plates 76and 78, valve 5 dand' valvestem 58 and the sizeas f of the orifice 68, the upper diaphragm 84 v in the put/let chamber46 is decreased, at the same time inducing a lower pressure in the lowerportion of the diaphragm chamber 14,

However, if at any time the pressure difierelltlll OD. opposite sides ofthe diaphragm 7( increases beyond that for which the de v1ce isconstructed, the valve 54 will tend 'of the demand limit set by it, theresult will be to. reduce the gas pressure in the linewithout increasingthe rate of flow. Whenever able drop in pressure.

the rate of flow of gas afterh'aving attained.

the maximum degree is reduced below such degree,.the valve 54: againcomes under the control of the pressure regulatingdiaphragm 84. v

- In passing through meters, such, for example, as those employed tomeasure domestic consumption, gas undergoes'a consider- In the use ofdevices containing valves for controllingt'he flow of fluid and having avalve actuating element or' elements located .directly .in the path offlow of the fluid, it is found,iin the event that the fluid isintroduced into.the device at high pressure, that the valve may beprevented from functioning properly by the velocity with which the gasacts on the valve actuating element. An important advantage of theillustrated device is that the gas. Consequently, the device willoperate" -'diaphragms are so disposed as .not to be aflected appreciablyby any influence other than differences in the static pressure of thesatisfactorily either on the inlet or outlet side of a meter, 1

The maximum allowed rate of flow of gasthrough the device may beincrea'sedby adding to the weight of the load on ,the diaphragm 70 or'bging a larger ori e than the disc previously in use.. "Likewise, thepressure at which gas" is delivered from the device may be increased ordecreased by increasing ordecreasing the load on the diaphragm 84.

Incases where the mains are large enough 'to deliver an adequate supplyof. gas even though the pressure in them is relatively.

low, it may not be necessaryor advisable to regulate the pressure in theservice lines. Under such conditions,-the device of this inventien maybe utilized to limit the demand on the lines without pressureregulation.

I To this end, the ring 72-and the parts carried by it, including thediaphragm 84 and cap 98, may be removed and a solid cap 108 substitutedtherefor, as indicated in Fig. 1() The cap 108 is provided with a duct-174 analogous to the duct 74 in the ring 72. In this form of the device,the valve stem 58 is fitted tightly into the eye 80 .ofthe diaphragm soas to cause the valve 54 to partake of all of the movements of thediaphragm. The construction and operation v of the diaphragm 70 andvalve 54 in' the latter form of the device do not, it is believed,require further explanation, inasmuch as they are similar to that ofcorresponding under variable pressure.

employinga disc '66 havpartsin the device when constructed to serve bothas a demand limiting and pressureregulating device.

' The inventionhaving been thus described,

what is claimed as new andis desired to be secured by L'etters Patent ofthe United.

pressureof fluid passing through the 'conductor, a valve'forcontrollingthe flow of fluid controlling mechanism, a.

fluid through the conductor, means for opersure differential ofthdfluidon opposit sides of the first-mentioned means to limitthe. rate of Howof fluid thioughthe conductor, and

ating the valv'ijn accordance with thepresmeans for;regulating thepressure at which fluid is-deliv'ered fromthe conductor.

" .2. A fluid controlling meamn s'm wherein a difference of pressurethereiminfluen'ces devices controllin the'pressu're at which the fluidis delivered herefrom whendeliveringa variableyolume of fluidand inwhicha pressure differential ingfluid pass in therethrough influencesdevices controlling the volume of flow of fluid when delivering fluid 3.A'fluid controlling mechanism having.

devices .for causing a drop in pressure of fluid passing througha'conductor therein and devices adapted to utilize thepressuredifl'erential on opposite sides of said first- Inentioned devices tocontrol the flow of fluid through the conductor and other devices forregulating-thepressure at which the fluid is delivered from theconductor.

4. In a combined demand limiting and.

and a second diaphragm operatively con-.

nected to the valve and arranged to be conlivery side of the conductor.

5-. In a combined demand limiting and trolled by the pressureof thegason the del pressure regulating device for use. in gas distributingsystems, a conductor forgas, a

valve for controlling the flow of gas through the conductor, and aplurality ofdiaphragms I joined to the valve by lost motion connecttions, said conductor and. lost motion connections being constructed andarranged .to cause the valve to be coritrolledyin, its position by oneof the diaphragms under certain conditions of flow of gas through theconductor, and to cause the valve tobecontrolled in its position byanother of the diaphragms under certainother conditions of p flow of gasthrough the conductor.

6. In a fluid controlling mechanism, a]

andto cause the other-side of the second- ;mentioned'diaphragm to besubject to atmos-- phericl pressure only, and connections befluidconductor, means for controlling the flow of fluid through the conductorcomprising a valve arranged to approach its closed position when it israised, a pair oi loaded diaphragms, connections between the diaphragmsand the valve constructed to raise the valve uponv elevation of eitherof the diaphragms, and means for causing each of structed to. cause thethe diaphragms to be raised under certain difl'erent conditions of flow,of fluid through the conductor.

7. In a fluidco'ntrolling device, a valve, :1.

pair of diaphragms,mechanism for providing a point of restricted flow offluid in its passage through the device t'oinduce adr'op in pressure ofthe fluid, a'housing for the valve, diaphragms and, mechanism,- confon'tliejsupplyjside oftfieipoint ofrestricted ,fluidion the deliveryside of the point of 'strict'ed' fliiw to -fbe transmitted to theothervside of the first-mentfioned diaphra m and flow jtobe. transmittedtoone side of one of the diaphragin's',ftotcaiise the pressure of theagainst one side 50f the [other di'ap ragm,

tween "the diaphragms and the valve constructed to cause the valve toapproach closed position upon movement of either of the diaphragms bpressure of the fluid.

' mechanism ;8.In-2i uid controlling device, a valve arranged toapproach its closed osition when it is raised, a airof superposediaphragms,

or providing a point of restricted flow of fluid inits passage throughthe device to induce a drop in pressure of the, fluid, a housing for thevalve, diaphragms and mechanism, constructed to cause the pressure ofthe fluid on the supply,

side of'the point of restricted fiow to be transmitted to the under sideof one of the diaphragms, to cause the pressure of the fluid on thedelivery side of the point of restricted flow to be transmitted to theupper side of the first-mentioned diaphragm and against the under sideof the other diaphragm, and to cause the upper side of the secondmentioned diaphragm to be subject toatmospheric pressure only, andconnections between the diaphragms and the valve for causing the valveto be raised upon elepressure of the fluid the conductor, means governedby the pressure difi'erential on opposite sidesqof the disk forcontrdllingthe flow of fluid" through theconducton'and means forlimiting the pressure at which'fluid is delivered from the conductor; vc

11. In a fluid controlling mechanism, a

fluid condiictor, means formaintaining the ,fluid o'nthe delivery sideof the conductor at a predetermined pressure of lesser degree thanthe'pressure of the fluid .on the supply side "of. the conductor, and meansfor rendering the first-mentioned means, inoperative to maintain thefluid on the outlet side of the condu c'tor" at: such predeterminedpressure When they-flow, of fluid through the conductor exceeds apredetermined rate.

F12. Ina fluid controlling mechanism, a

fluid conductor,ja..valve for controlling theflowof fluid through theconductor, means for operatingjthe valve to maintain the fluid onthe'delivery 'si'de of the conductor at a v predetermined pressure oflesser degree than the pressurejen-the supply side of the conductor, and'means'o' erable on-the valve to cause ittolimitlthe' ow of fluidthrough the conductor to a;- redetermined rate and acting to render-t e1first-mentioned means inoperative on the valve when the flow of fluidattains "such rate. I

13. In a, combined demand limiting and pressure regulating" device forgas distribut.

ing systems, a conductor or gas, a valve for controlling thepassa'ge ofgas through the conductor, adiaphragm for operating the valve to causegas' to be delivered from the conductor at a predetermined pressure, and

a second diaphragm operable to allow the valve to be controlledby thefirst-mentioned diaphragm only so'lo'ng as the flow of gas is below apredetermined rate and to limit the flow of gas to such predeterminedrate.

14. In a fluid controlling device, a fluid conductor, a valve forcontrolling the passage I i of fluid through the conductor, and a pairof diaphragms operable to control the 'valve selectively andindependently in accordance with varying conditions of flow of fluidthrough the conductor; a

15. In a fluid controlling device, the combination' with a housingconstructed to provide an inlet chamber, a diaphragm chamber, passagesextending downwardly from. the diaphragm chamber, ports establishingfluid communication between the inlet chamber and the diaphragm'chamberand passages respectively, an outlet chamber, and a duct leading fromthe outlet chamber to the diaphragm chamber, of a double valve forcontrolling the flow of fluid through the ports, a diaphragm operativelyconnected to the valve and located in the diaphragm chamber below thepointof communication of the duct with the diaphragm chamber, and anorifice disk disposed in the housing ;l'etehamber for causing a drop inpressure inf fluid passing through the device, the arra'ngement-beingsuchthat the pressure of the fluid on the supply side of theonifice'disk ist'ransmittedto thennder surface of the diaphragm and thepressure of. the fluid in the outlet chamber is transmitted to the upperside of the diaphragm so as to cause the valve to be controlled in itsposition by the 'difi'erential pressures on opposite sides of theorifice disk. I I

16. In a fluid controlling mechanism, a housing -formed to provide adiaphragm chamber and'an outlet'conduit separated by a substantiallyhorizontal wall, an orifice I disk disposed lh- 'S8ld wall for causing a.drop p'tessure'of fluid passing from the diaphragm chamber to theoutlet conduit, a valve for controlling the flow of fluid through thehousing, means for 'o crating the valve comprising a diaphragm isposedabove and in substantial parallelism with the orifice disk a loadinplate for the diaphragm extending perip erally beyond the orifice in theorificedisk so as-to prevent the portion 'of t. a diaphragm above theorifice disk from beangdraw'n downwardly by suc- "tion arising from theflow of fluid through the orifice of the disk, and means fortransmitting the I'BSS IlIB of the fluid in the outlet conduit to t e'uper side of the diaphragm as to cause t e valve to be operated in Iaccordance with theapr'essure diflerential on opposite sides of theorifice disk. I 17. FInca fluid controlling mechanism, the

combination with a housing constructed to -platefor loading thediaphragm, and lugs provide inlet chamber, a diaphragm I chamber," andassages extending downward- 1y from the-diaphragm chamber, of a valve,,cage" r'movably seated in the; housing and provided with ports forestablishing fluid communication between the inlet chamber and thediaphragm chamber and passages I respectivelfyii a double valve forcontrolling the flow o I u'id through the ports from the inlet chamberthe diaphragm chamber and the passages, a diaphragm in the dia phragmchamber operatively connected to the valve, and means for causing a dropin ressure of fluid passing through the hous-" mg, said housing beinconstructed to trans mit the pressure di erential on opposite sides ofsaid means to opposite sides of the diaphragm to cause the valve to becontrolled in accordance with such pressure difi'erentiaL. I v s 18. Ina fluid controlling device, a valve, a pair of superposed diaphragmsdisposed above .the' valve, an eye on the lower diaphragm, a stem onthevalve constructed to pass loosely through the eye and progided above theeye with an enlarged portion incapable of passing through the eye, aparts connected to the other diaphragm .and constructed loosely toreceive thiupp'er end of the valve stem, a second enlargement on thevalve stem adapted to interlock with said part upon upward ihovement ofthe diaphragm and the part, a nd a housing for the valve and thediaphragms constructed to induce movements of the diaphragms in ac-'cordance with varying conditions of flow of fluid through the device I,a

19. In a fluid controllingfmechanism, a valve, a pair of superposeddi'aphragms'dis posed above the valve, an elye o n' thelower diaphragm,a stem on the valve constructed to pass loosely through the eye-andprovided above the eye with an enlarged portion incapableof passing!through the eye, a part connected to the other diaphragm and constructed loosely to receive the upper end of the valve stem, a secondenlargementon the valve .stem adapted to s 'interlock with said part'upon upward movement of the diaphragm and the part, meansgfoif causing'aI rop in pressure of fluid assing thru the mechanism,-and a housing orthe valve, diaphragms', and said means constructed to induce movement ofthe lower diaphragm in accordance wi h :the pressure difierential onopposite sides of. the said means: and to induce movement of the upperdiaphragm in accordance with the pressure at which fluid isdeliveredfrom the mechanism. f

20. In a fluid controlling device, a housing constructed to allow 'fiuidto pass through it, a valve for controlling the pa I sage of fluidthrough thehousing, a dia phragm in the housing, avalve stem forconnecting the valve with the diaphragm, a

on the housing arranged to limit the lateral movements of the plate soas to preventinjury to the valve stem. I

21. In a 'fluid controlling device, a hous= ing constructed to allowfluid to pass through it, a valve for controlling the passage of fluidthrough the housing, a stem vation of the diaphragm, and means forclosing the upper end of the chamber to I prev'enhpassageof fluid frombeneaththe diaphragm to theupper side or the diaphragm. I I 5 22. In afluid controlling device, a housing constructed to allow fluid to passthrough it, avalve for controlling the [passage of fluid through thehousing, a stem on the valve extending upwardly from the valve and pro-'v having an enlargement on its upper end, a diaphragm in the housing, aplate on the under side of the diaphragm'constructed to provide achamber of larger cross-sectional dimensions than the enlargement on thevalve stemto receive such enlargement and a portlon adapted to underliethe enlargement on'the valve stem so as to allow lost motion between thediaphragm and the valve the pressure differential of the fluidjon oppmsite sides of said means; a second diaphragm, operatively connected tothe valve and arranged to be controlled by the pressure of the fluidon-the delivery side-of the conduc f tor, chambers for the diaphragmsandmeansfor establishing fluid communication between the top of one ofsaid'chambers and the bottom of the other chamber.

24. In a fluid controlling mechanism, a" fluid conductor,.a-valvecontrolling the pass age of fluid through the-conduet0r,-a 'diaphragmconnected to the valve, a'-housing for the diaphragm, a baflie inthehousing positioned to divide the housing s c'e into an entrance chamberand a diaphragmfch'amber, each of said chambers having a com parativelylarge volume, said housin'g'being connected with the outlet" side oftheconductor in such a manner that the'onlyentrance of fluid from theoutlet side of the. conductor is into the'entrance chamber, and

a restricted opening in the balfle'constituting the sole passage, of'flu id' from the entrance chamber to the diaphragm chamber.

25. In a fluid controlling device,a housing constructed to; permit fluidto] pass through; it, a valve for controlling the passage of fluidthrough th housing, a plurality of.

atmosphere an manner superposed diaphragms 'in the housing, lost motionconnections between the, diaphragms and the valve, said lost motionconnections and the housing-being constructed'to cause the valve to becohtr'olledby one of the diaphragms under certain conditions of-flow' offluid through the housin and to cause-the 5 by the other diavalve to becontrolled phragm under certain other conditions of floiv of fluidthrough the housing, andpa baflie plate interposed between thediaphragms.

, 26. In a arranged to approach 'its closed position when it is raised,a pair of superposed dia phragms,zmechanism for providing a point vofrestrlct'ed'tiow of fluid in its passage through the device to induceajdfOELm pressure oithe 'fluid, a housing fort e valve, diaphragms andmechanism, constructed to cause the pressure of the fluid on the supplyfiuidfeontrollin'g device, a valve side" of the point/of restrictedflow": to be transmitted to the under side of one of the i diaphragms,to cause .the pressure of the fluid on the delivery side of the point ofsecond-mentioned diaphragm to be subject -toatmosphericpressure only,connections betweenlthe diaphragms and the valve for causing the valveto be raised upon elevation of either of the diaphragms, and a bafileplate interposed between the diaphragms.

27. The combination of a gas conduit, valve means governing the flow ofgas through saidconduit, a pair of diaphragms controlling said means andhaving operating connections therewith and one of said diaphragms havinone side exposed to the the other exposed to the pressure of gas fromsaid conduit, and means in the'ip'ath of the gas passing through saidconduit for producing a drop in pressure in said ga's,-the other of saiddiaphragms being exposedon one side to the pressure of said gas afterpassing through said means.

In testimony whereofI afiix my signature.

' JAMEsPoW LL FISHER.

restricted flow to be transmitted to the upperside of thefirst-mentioned diaphragm and against thexu'nder side of the otherdiafphra gm, andto cause the other side of the so

